|Question:||Today was a holiday|
|Lesson:||Emma's Students Stories, My Students' Writings by Emma|
but i guess there are exemptions, depending on how the sentence is structured e.x. "Today was a holiday that's why we did what we did." like here, where the later half of the sentence is past tense, the first half will be as well. I'm not really sure how it works.
Think of the difference between:
"Today is a holiday, so we are going to the beach."
"Today was a holiday, so we went to the beach."
In the first sentence, you're telling someone either what you're doing right now, or what you will do later today.
In the second sentence, you're telling someone what you've already done today. Perhaps the person you're speaking to didn't know it was a holiday.